#include<stdio.h>
#define PI 3.14
main(){
	int r = 0;
	printf("请输入圆的半径：\n");
	scanf("%d",&r);
	printf("圆的面积为：%d \n",area(r));
	printf("圆的周长为：%d \n",leght(r));
}
int area(int r){
	return PI * r *r;
}
int  leght(int r){
	return 2 * PI * r;
}
